Prosecutor alleged city events official Kenneth Brissette compelled a production company to hire union workers

BOSTON—Federal authorities arrested a high-ranking member of the mayor’s administration Thursday after a federal grand jury indicted the city events official for allegedly extorting a production company by requiring it to hire union workers.

The U.S. attorney’s office in Boston alleged in an indictment that Kenneth Brissette, who directs the city’s Office of Tourism, Sports and Entertainment, and at least one other unnamed City Hall employee repeatedly told the production company in mid-2014 that it needed to hire union workers...